Installation Guidelines - Cisco Catalyst 9500 Series Hardware Installation Manual

Installing a Power Supply
The power supplies can work together in Redundant Mode, in which each power supply operates at
approximately 50 percent of its capacity, no greater than 60 percent and no less than 40 percent. If one power
supply fails, the other power supply can provide power for the entire system on its own. This is the default
and recommended mode for production.

Installation Guidelines

• The switch chassis must be installed in a cabinet or rack that is secured to the data center.
• Remove the power supply from its shipping container and remove any packaging.
• You need the following additional tools and equipment:
• The chassis is connected to an earth ground.
• You have receptacles for the power sources within reach of the power supply cables.
• If you are connecting to a DC power, check that you are using 8-24 AWG power cables to connect to
• If you are installing more than one DC-input power supply, each must be protected by a dedicated circuit
• The power sources are rated as follows:
• The power supply is already inserted into the chassis.
Ensure that the power source is OFF. As an added precaution, place the appropriate safety flag and lockout
Caution
devices at the source power circuit breaker, or place a piece of adhesive tape over the circuit breaker handle
to prevent accidental power restoration while you are working on the circuit.
◦ Nut driver attachment for number 1 Phillips-head screwdriver or ratchet wrench with torque
capability (used only for DC-input power supplies).
◦ For the DC-input power supply, you need four power cables sized to reach the DC power source
or power interface unit (PIU).
◦Grounding wire — Size this wire to meet local and national installation requirements. For U.S.
installations, you must use a 8-24 AWG copper conductor. For installations outside the U.S.,
consult your local and national electrical codes. The length of the grounding wire depends on the
proximity of the switch to proper grounding facilities.
the power supply. The 8-24 AWG wire size applies to the negative [-], and positive [+] cables that
connect to negative and positive apertures on the connector. You have to procure the power cable.
breaker or a fuse that is sized according to the power supply input rating and the local or national electrical
code requirements.
◦For North American AC-input installations—10A with 110V circuits.
◦For North American DC-input installations—(–48 VDC nominal at 37 A in North America
(operating range: –40.5 to –56 VDC).
◦For international installations—Size the circuits by local and national standards.
Cisco Catalyst 9500 Series Switches Hardware Installation Guide
Installation Guidelines
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